10 PKOCEEDINGS OP THE NATIONAL MUSEUM vol.72 



Gonopods very long; the anterior pair extending forward beyond 

 the basal joints of the two preceding pairs of legs, the terminal seg- 

 ment quite slender, slightly tapering, nearly straight, and as long or 

 slightly longer than the other joints taken together; posterior gono- 

 pods longer than the anterior pair and more slender, the last joint 

 simple, very long and slender and reaching the apex of the anterior 

 gonopods. 



Type.—Q^i. No. 975, U.S.N.M. 



Three specimens, a male and two females, were found by L. R. 

 Lytton, in company with O. F. Cook, October 27, 1924, on slightly 

 moist soil largely composed of loose decomposed granite, under large 

 stones in an open dry place near the summit of a pass, \y^ miles 

 north of the monument marking the boundary of Gila and Pinal 

 Counties, on the road between Superior and Miami, Ariz. The con- 

 ditions appeared quite unfavorable for a humus fauna and even with 

 much digging no other millipeds and no thread centipeds (Geophili- 

 dae and related families) were found. Only a few Scolopendridae 

 and Lithobidae and a few specimens of Ja'pyx were seen. 



On January 28, 1925, after the region had been covered by snow 

 and ice, a long and diligent search of the same locality by the writers 

 was rewarded with but two living female specimens and two dead 

 specimens, the sex of which was not determined. Other humus ani- 

 mals were much more plentiful than in October and four other 

 species of millipeds were collected. The locality was visited again by 

 Mr. and Mrs. Loomis on March 1, 1925, when four more specimens 

 were found. Two of these were males with 98 and 108 segments, 

 respectively. 



SIPHON ACME PSEUSTES ( Chamber lin) 



Siphonophora pseustes Chambeblin, Proc. Cal. Acad. Sci., ser. 4, vol. 12, 1923, 

 pp. 389-402. 



From the drawings and description of Siphonophora pseustes 

 Chamberlin * it seems probable that this species should be placed in 

 SiphonacTne, but Siphonacme pseustes apparently is distinct from 

 Siphonacme lyttoni in having the beak and antennae longer, in the 

 more deeply emarginate first segment, and the body with fewer seg- 

 ments, especially in the males. Possibly an examination of the gono- 

 pods of Siphonophora glohiceps Pocock would show it should be in- 

 cluded in SiphoTUicme. 



ILLACME, new genus 



Type. — Illacme plenipes^ a new species from California. 

 Diagnosis. — Similar to Siphonophora and Siphonacme but readily 

 distinguished by the triangular-cordate head, narrowed gradually 



*0n chilopods and diplopods from islands in the Gulf of California. Proc. Cal. Acad. 

 Sci., ser. 4, vol. 12, pp. 389-407, 1923. 



